//
//  ViewController.swift
//  SwiftUtils
//
//  Created by wangyu on 10/28/21.
//

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        
        print("#### start ####")
        
        let s = "a.b.c"
        print(s.substring(start: 0, length: 2))
        
        print("#### end ####")
    }


}

